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19 May, 00:04

You need to prepare 50g of an ointment with 15% of zinc oxide. However, your pharmacy has no zinc oxide powder and the only thing you have is two lots of zinc oxide ointment containing, respectively, 50% and 5% of zinc oxide.

1. How many grams of the 50% ointment you need to prepare this formula?

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  1. 19 May, 00:28
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    15g ointment at 50%

    Step-by-step explanation:

    Data

    We need to prepare 50g of an ointment with 15% of zinc oxide (O15)

    with a Lote 1 = 50% zinc oxide

    50% ⇒ 100g oinment 50g are zinc oxide, so

    50g ointment 15% ⇒ 50g oinment*15zo/100g ointment = 7.5g zo, also

    g ointment = 100g ointment*7.5g zo*/50g zo = 15g ointment
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